Syntax

1. <default_spec> ::=
     DEFAULT <literal>
   | DEFAULT NULL
   | DEFAULT USER
   | DEFAULT USERGROUP
   | DEFAULT SYSDBA
   | DEFAULT DATE
   | DEFAULT TIME
   | DEFAULT TIMESTAMP
   | DEFAULT UTCODE
   | DEFAULT UTCDIFF
   | DEFAULT TIMEZONE
   | DEFAULT TRUE
   | DEFAULT FALSE
   | DEFAULT TRANSACTION
   | DEFAULT SAMP
   | DEFAULT SERIAL [(<unsigned_integer>)]